You can register your bicycle by mail.  Access the Bicycle Registration Form here, print the form, fill in the requred information, and mail it with the required $1 fee to: 

Manchester Police Department
Traffic Unit
405 Valley Street
Manchester, NH 03103

If you have any questions or problems, please contact the Traffic Division at (603) 668-8711 x5440.

Fee and Duration: The City of Manchester Code of Ordinances (§72.23) requires a fee of $1 for each bicycle registration.  Upon receipt of the fee and completed form, the Police Department will mail the applicant a registration certificate and sticker to the address the applicant provides on the registration form.  The bicycle shall be considered registered for the life of the bike, unless the registration sticker is mutilated, destroyed, altered, or the ownership of the bicycle has been transferred to another person.